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Bartosz Góralewicz is the CEO at Elephate, an SEO agency that specializes in preventing and curing technical SEO issues for businesses of all sizes, including renowned international corporations. He is passionate about sharing his expertise and frequently publishes thorough case studies. In his off time, he enjoys spending time with his wife and two young baby girls.

Maximilian, this sounds interesting, can you share the URL? There are few things that differ Chrome 41 from GSC (e.g. Chrome 41 will work with HTTP/2 and GSC wont). We had couple of examples, where GSC would be different from Chrome 41 and every time it was due to CSS issues. It would be great to have a look at the URL :)

This is a good question, but unfortunately I can't answer it. I would guess that MOZ doesn't crawl JS. Most (if not all) crawlers don't do that. There is an interesting quote from Ahrefs CEO http://searchengineland.com/know-google-sees-javas... "To execute JS for every page at our scale [would] require 10,000-15,000 servers, and we believe our customers are not ready to pay for that yet" and I think this answers your question. I think it is still too expensive to crawl JS on a mass scale.

HTML is definitely the safest option. At the same time, JS is not in inherently wrong. You can use isomorphic JS as I wrote in https://www.searchenginejournal.com/javascript-seo... at the same time, you need to remember, that using JS needs MUCH more expertise thank HTML/CSS. For most webmasters, sticking to HTML is the safest and the cheapest/fastest way to develop an SEO friendly website.

Thanks Barry, I was actually looking forward to your feedback! I love your articles about crawling and indexing.If you only have one nitpick from reading this article, it means I did something right :) I will make sure this is corrected in the article. THanks again!

I was thinking about this approach, but it was much easier to simply submit a website to different browser and see if it is indexed. Going deeper into specific crawlers is definitely an interesting topic though.

Thanks Angel! I was surprised to see how well my experiments were received. I will definitely make sure to keep you guys up to date with more of our findings as JS crawling topic is extremely complex and exciting.

Thank you for your comment Ferencz, in our experiments, we found that Angular 1 is indeed indexable, but it is really difficult to rank and to get a decent indexation/crawling budget with Angular websites. What is your experience?